Elevator-brake



(No Model.)

G. LAGERQUIST. ELEVATOR BRAKE.

atented Dec. 15, 1891.

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l'aqervyuz'st 3y I A t- UNITED STATES PATENT OFFICE.

lUST. LAGERQUIST, OF MINNEAPOLIS, MINNESOTA.

ELEVATOR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 465,325, dated December15, 1891.

Application filed May 1, 1891. Serial No. 391,224. (No model.) i

To aZZ whom it may concern.-

Be it known that I, GUST. LAGERQUIST, of Minneapolis, in the county ofHennepin and State of Minnesota. have invented certain Improvements inElevator-Brakes, of which the following is a specification.

My invention relates to means for limiting the falling speed of anelevator-car and for stopping the car entirely; and the object I have inview is to provide a friction-brake and means for applying the same,which will be absolutely reliable and safe and at the same time of aconstruction simple and cheap to manufacture.

The invention consists in a friction-wheel provided in connection withthe elevator hand cable-wheel, in combination with a frictionclutch-strap, together with a bell-crank lever, to which the ends of thestrap are attached, and a cam and brake-rope wheel adapted to operatethe same to tighten or loosen said strap about said friction-wheel.

My invention consists, further, in various details of construction andin combinations hereinafter described, and particularly pointed out inthe claims.

The construction of my newly-invented apparatus will be more readilyunderstood by reference to the accompanying drawings, in which Figure 1is a general vertical view of an elevator apparatus provided with abrake embodying my invention. Fig. 2 is an isometric view of thebellcrank lever employed in connection with the same device.

-My apparatus is especially designed for use in. connection with handelevators. Such elevators are usually operated by a large loose cable orrope passing over a wheel of large diameter provided in the top of theshaft and operating elevator cable-drums through a system ofreducing-gears. Such a wheel is represented by that numbered 2 in thedrawings. The rope or cable 3 passes in a loop over and around thiswheel, and through the same operates the pinion 4 on the shaft 5 of thewheel 2. The pinion meshes with the large gear 6, which in turn gearswith pinions (not shown) on the elevator-drums. A friction-wheel 7 of asize proportioned to the carrying capacity of the elevator is fixed onthe wheel 2 or the shaft 5 thereof, and is provided with a fiatfriction-surface adapted to receive the friction-strap 8. This strap 8has its ends 9 andv 10 secured in the arms 11 and 12 of the bell-.

crank lever. The ends 9 and 10 of this friction-strap are twisted atright angles to the rest of the strap, and are provided with one or moreopenings adapted to-receive the bolts 13 and 14, passing throughsuitable openings in the arms 11 and 12 of the bell-crank lover.

The bell-crank is pivoted upon the stationary shaft or stud 15,fixediupon the cross-beam 16, or other suitable support. The lower arm11 of this bell-crank is about half the length of the upper arm 12; butthe distances between the centers of the bolts 13 and 14 and the centerof the stud are substantially the same. Slots 17 and 18 are provided inthe arms to receive the ends 9 and 10 of the strap, the same being largeenough to allow the ends free movement upon the bolts 13 and 14 aspivots. I may provide several bolt-holes in each arm for the accurateinitial adjustment of the friction-strap. The upper end of the arm 11 isprovided with a lateral pin or lug 19, adapted to project into the slotor spiral way 20 and to engage the walls formed in or upon the side ofthe brake-rope wheel 21. The

brake-rope wheel is secured upon a short stationary shaft 22. I

Considerable tension will obviously be exerted upon the walls of thecam-slot, and hence they should be strong, but need not occupy the fullface of the wheel. I therefore form the walls 23 about as shown. Thebrakerope 24 is preferably wound in adeep groove provided in the face ofthe brake-wheel, the rope being wound several times about the wheel togive sufficient grip thereon to prevent the rope from slipping.

It will be seen that when the rope is pulled down in the direction ofthe arrow the wheel 21 will be rotated to throw the lug 19 and the endof. the arm 16 in toward the center of the brake wheel shaft 22. Thismovement draws the strap 8 tightly about the periphery of thefriction-wheel 7, thereby-partially or wholly preventing the movement ofthe same and of the elevator-car. The farther the lug 19 is drawn intoward the center of the brakerope wheel and the inner end of thecam-slot the tighter will be the grip of the friction-strap upon thewheel 9. On the until again free-by the operation of the rope 25 toloosen the strap on the same.

My brake apparatus is especially useful when used in connection withelevators employed in lowering heavy weights.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent- 1. The combination,with the shaft 5 and wheel 2,0f the friction-wheel provided inconnection therewith, a friction-strap 8, a bellcrank lever engaging theends thereof, a cam-wheel provided in connection with a brake-rope wheeland havingacam-slot, alug or pin upon the said bell-crank lever adaptedto enter said slot, and a brake-rope passing over said brake-rope wheel,whereby the tension or grip of said strap upon the said friction-wheelmay be accurately adjusted, substantially as described.

2. The combination of the wheel or pulley 2 and the shaft 5 thereof,with the frictionwheel 7 secured thereon, the strap 8, the bellcranklever having arms 11 and 12 and pivoted on a stationary stud 15, theends of said strap secured in the arms of said lever, a camwheel havinga cam-slot, means for operating the same, and a pin or lug on said arm11, adapted to enter said slot, substantially as and for the purposespecified.

3. The combination, with the Wheel 2, of the friction-Wheel securedthereon, the strap 8, having ends 9 and 10, the bell-crank lever havingarms 11 and 12, in which said ends are secured, the cam and brake-ropewheel 21, provided with the cam slot 20, means whereby said wheel.2-l isadapted to be revolved, and a pin or l'ug 19, provided on the end of thearm 11 and projecting into said slot 20, substantially as and for thepurpose specified.

In testimony whereof I have hereunto set my hand this 28th day of April,1891.

GUST. LAGERQUIST.

In presence of O. G. HAWLEY, FRED S. LYON.

